|~The Lovely & Fair Annie~|
As you may or may not know, all of the dog's love Annie. Lucas admires her from a safe distance because Sheba defends and protects her. Sandy can't see her, but that doesn't matter, if she's nearby he knows it and will follow her anywhere. Even Charlie seems happier when Annie is around. I guess given all that attraction to Annie it may just make sense that Todd would find something else to 'admire' about her.
|~The Blonde Sisterhood, Sheba (left) and Annie~|